@Test public void sumUsingForLoop() { assertThat(arrayOperations.sumUsingForLoop(null), is(0)); assertThat(arrayOperations.sumUsingForLoop(new int[] {}), is(0)); assertThat(arrayOperations.sumUsingForLoop(new int[] {1}), is(1)); assertThat(arrayOperations.sumUsingForLoop(new int[] {1, 4, 5, 8}), is(18)); }